Posted by niles28 on Monday, December 3, 2012 at 1:20am.
Carbon14 has a halflife of 5730 . In a plant fossil, you find that the has decayed to 1/32.0 of the original amount. How long ago was this plant alive?

chemistry  DrBob222, Monday, December 3, 2012 at 3:06pm
k = 0.693/t_{1/2}
Solve for k.
ln(No/N) = kt
You can make No any convenient number. I would pick 64/
N is No x (1/32) = ? for No = 64 that is 2.00
k from above.
Solve for t in years.